Reader Loop: undefined method handle_frameset for nil:NilClass

[milgner]

Bunny version: 2.22.0
RabbitMQ version: 3.12.4-1.el8

Recent RabbitMQ log file contents:

2023-09-27 12:02:16.343241+02:00 [warning] <0.142669.0> Consumer 261209 on channel 2 has timed out waiting for delivery acknowledgement. Timeout used: 1800000 ms. This timeout value can be configured, see consumers doc guide to learn more
2023-09-27 12:02:19.603581+02:00 [error] <0.142669.0> Channel error on connection <0.142655.0> ([::1]:38200 -> [::1]:5672, vhost: '/', user: '***'), channel 2:
2023-09-27 12:02:19.603581+02:00 [error] <0.142669.0> operation none caused a channel exception precondition_failed: delivery acknowledgement on channel 2 timed out. Timeout value used: 1800000 ms. This timeout value can be configured, see consumers doc guide to learn more
2023-09-27 12:02:20.019994+02:00 [error] <0.169645.0> Channel error on connection <0.142655.0> ([::1]:38200 -> [::1]:5672, vhost: '/', user: '***'), channel 1:
2023-09-27 12:02:20.019994+02:00 [error] <0.169645.0> operation basic.ack caused a channel exception precondition_failed: unknown delivery tag 261377

Full exception stack traces:

/app/vendor/bundle/ruby/3.0.0/gems/bunny-2.22.0/lib/bunny/session.rb:722:in `handle_frameset': undefined method `handle_frameset' for nil:NilClass (NoMethodError)
/app/vendor/bundle/ruby/3.0.0/gems/bunny-2.22.0/lib/bunny/reader_loop.rb:90:in `run_once'
/app/vendor/bundle/ruby/3.0.0/gems/opentelemetry-instrumentation-bunny-0.20.0/lib/opentelemetry/instrumentation/bunny/patches/reader_loop.rb:16:in `block in run_once'
/app/vendor/bundle/ruby/3.0.0/gems/opentelemetry-api-1.1.0/lib/opentelemetry/trace.rb:72:in `block in with_span'
/app/vendor/bundle/ruby/3.0.0/gems/opentelemetry-api-1.1.0/lib/opentelemetry/context.rb:87:in `with_value'
/app/vendor/bundle/ruby/3.0.0/gems/opentelemetry-api-1.1.0/lib/opentelemetry/trace.rb:72:in `with_span'
/app/vendor/bundle/ruby/3.0.0/gems/opentelemetry-api-1.1.0/lib/opentelemetry/trace/tracer.rb:29:in `in_span'
/app/vendor/bundle/ruby/3.0.0/gems/opentelemetry-instrumentation-bunny-0.20.0/lib/opentelemetry/instrumentation/bunny/patches/reader_loop.rb:15:in `run_once'
/app/vendor/bundle/ruby/3.0.0/gems/bunny-2.22.0/lib/bunny/reader_loop.rb:39:in `block in run_loop'
/app/vendor/bundle/ruby/3.0.0/gems/bunny-2.22.0/lib/bunny/reader_loop.rb:36:in `loop'

I still have to find out where the timeout in the server log comes from: the application was running fine and all messages had been processed up to that point.